Rotary face bit



I May 25, 1937. F. E. JARVIS ROTARY FACE BIT 'Filed Nov. 9, 1936 A itomeys Patented May 25 1937 UNITED STATES PATENT OFFICE z,oa1,so2

sonar race arr Frank E. Jarvis, The Dallas, Ores. Application November s, 1936, Serial at. 109,987 2 Claims. (01. 255-12) lo feed, and at the same time to keep the settings from wearing out thus'prolonging the life of the bit.

The invention together with its objects and advantages will be best understood from a study 15 of the following description taken in connection with the accompanying drawing wherein:-

Figure 1 is an elevational view showing the bit as applied to the core barrel.

Figure 2 is a face view of the bit, showing the arrangement of the inserts, and

Figure 3 is a sectional view taken substantially on the line 3--3 of Figure 2.

Referring to the drawing by reference numerals it will be seen that the face bit is con- 5 ventional insofar as it consists ofva head I having an integral exteriorly threaded hollow col-' lar 2 by means of which the face bit is threaded into the end of the usual drill rod or drill barrel 3 of a drilling machine; and insofar as it also 30 is provided with the water groovm l in the periphery thereof and the diamonds i in the face thereof.

The present invention consists in providing in the head i of the bit adjacent to each groove l 35 and at one side of the groove an insert I of tungsten carbide (generally welded or brazed) with these inserts, as shown, extending parallel to the axis of the bit and to one side of and parallel with thewatergrooves. Also,atthefreeendedges' thereof the inserts 5 project slightly in advance of the diamond studded face of the bit to terminate substantially co-planar with the faces of the diamonds.

It has been found that these inserts of tungsten carbide serve to regulate the rapidity with which the diamonds feed and keep the settings from wearing out thus prolonging the life of the bit. Further, it has been found that by placing the tungsten carbide inserts behind the water grooves as shown, the side of the bit is protected from wear which is generally caused by the ground-up sludge. This is due to the fact that the tungsten is a harder material than that from which the body or head of the bit is made. Also, 1 by using three or more inserts of tungsten, de-

pending upon the size of the bit, the tungsten inserts tend to steady the bit and prevent the vibration and Jar, usually caused by the drill rods, from injuring the diamonds.

Having thus described the invention, what is claimed is:-

1. A hollow drill bit having a head provided inthe face thereof with diamonds. and in the periphery thereof with circumferentially spaced water grooves and inserts of tungsten carbide disposed adjacent to and paralleling said grooves.

2. A hollow drill bit having a head provided in the face thereof with diamonds, and in the periphery thereof with circumferentiaily spaced water grooves and inserts of tungsten carbide disposed adjacent to and paralleling said grooves, said tungsten carbide inserts projecting at one end beyond the diamond-studded face of the drill bit head to terminate substantially co-terminus with the working faces of the diamonds.

I'RANK E. JARVIS. 

